Samsung SCC-C6405 Manuel D'instructions page 9

Setting RS-422A/RS-485 termination
As it is shown in the structure map, when Controller and RS-422A/RS-
485 is connected it should be terminated according to the Cable feature
of impedance on the each end of the transmitting line to transfer the
signals in long distance by controlling the reflection of the signals to the
lowest.
Division
<RS-485 Half Duplex Organization>
Termination: using numbers 1 and 2 PIN, turn to ON and it will be terminated.
Division
<RS-422A/RS-485 Full Duplex Organization>
1-11
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n < 32
Termination
SW1-ON
n < 32
Division
SW1-ON
SW2-ON
Chapter 2 SCC-C6405(P) Installation
In this chapter, we will check the contents of the package before
installing the SCC-C6405(P), and prepare a power adapter suitable
for the power supply system.
(Power Consumption: 18W; Voltage: AC24V, 1.5A)
Then, we will install the SCC-C6405(P) and connect the cables.
E
2-1